Nicaragua residents enjoy their new clean drinking water that they have because of relief efforts provided by non-governmental organizations (NGOs) like El Provenir and Agua Para Vida. U.S. Air Force Staff Sgt. Jon Polka, a Reserve loadmaster from the 728 Airlift Squadron out of McChord Field, Wash., spent three weeks in August 2010 as a volunteer photographer for Blue Planet Network, a NGO-funding organization that address the global water crisis. (Courtesy Photo/Staff Sgt. Jon Polka)
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